High frequency oscillator, high frequency welding system and method for controlling the frequency using said type of high frequency oscillator

Patent metadata

Field	Value
Publication number	US-10239261-B2
Application number	US-201414787309-A
Country	US
Kind code	B2
Filing date	Apr 8, 2014
Priority date	May 24, 2013
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

A high-frequency oscillator includes an electric resonant circuit, and a high-frequency welding system and a method for controlling the frequency uses a high-frequency oscillator, in particular in a high-frequency welding system. The electric resonant circuit includes at least one electronic component having an inductance and at least one capacitor having a capacitance. At least one additional magnetic coil is associated with the electronic component and can electronically influence the inductance of the electronic component.

First claim

The invention claimed is:

1. A high frequency oscillator ( 1 ) with an electric resonant circuit ( 2 ) comprising at least one electronic component ( 3 ) having an inductance and at least one capacitor ( 4 ), wherein at least one magnetic coil ( 6 ) is associated with the electronic component ( 3 ) and with which the inductance of the electronic component is electronically influenceable, and wherein the electronic component ( 3 ) has at least one copper tube that is passed through the magnetic coil ( 6 ).

2. The high frequency oscillator according to claim 1 , wherein the magnetic coil ( 6 ) is integrated into a control circuit ( 8 ) for controlling the frequency of the high frequency oscillator ( 1 ).

3. The high frequency oscillator according to claim 1 , wherein the magnetic coil ( 6 ) is operable with a direct current.

4. The high frequency oscillator according to claim 1 , wherein the magnetic coil ( 6 ) is wound on a ring ( 5 ) of ferromagnetic material.

5. The high frequency oscillator according to claim 1 , wherein it is designed as a high frequency generator or as a high frequency filter.

6. A high frequency welding system for high frequency welding of plastics with at least one high frequency oscillator ( 1 ) according to claim 1 , wherein the high frequency oscillator ( 1 ) is integrated into a high frequency circuit ( 21 ) and/or a load circuit ( 11 ) of the high frequency welding system ( 9 ).

7. The high frequency welding system according to claim 6 , wherein it has a higher-level controller ( 15 ) for tuning the frequency in the high frequency circuit ( 21 ) and/or for tuning the resonance frequency in the load circuit ( 11 ).

Assignees

• Kiefel Gmbh

Inventors

• Martinez Vela Fernando

Classifications

• B29C66/95

  by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 · CPC title

• H03J3/20

  of single resonant circuit by varying inductance only or capacitance only · CPC title

• H03B1/02 Primary

  Structural details of power oscillators, e.g. for heating {(construction of transmitters H04B; features of generators for heating by electromagnetic fields H05B6/00)} · CPC title

• H03J3/16

  Tuning without displacement of reactive element, e.g. by varying permeability · CPC title

• B29C65/04

  Dielectric heating, e.g. high-frequency welding {, i.e. radio frequency welding of plastic materials having dielectric properties, e.g. PVC} · CPC title